Funny St. Patricks Day Outfit - Best Saint Patrick Day Party, Also Great gift For Any Irish Infant. Great gift idea for a baby with this cutest onesie. Premium quality, long sleeve baby romper bodysuit. 100% combed-cotton (preshrunk,) machine washable, cozy one-piece overall for your infant! overlapping expandable shoulders and three-snap closure at the bottom to make changing for your child as smooth and easy as possible. Available in a wide variety of sizes - newborn, 0-3 months, 3-6 months, 6-12 months and 12-18 months.